Air-compressor valve.



No. 713,66I. Patented Nov. I8, |902. F. M. METCALF.

AIR COMPBESSUR VALVE.

(Application led Apr. 28, 1902.)

tren Sterns FOSTER M. METCALF, OF BATTLECREEK, MICHIGAN, ASSIGNOR TO AMERICAN STEAM PUMP COMPANY, OF BATTLECREEK, MICHIGAN.

AIR-COM PRESSOR VALVE.

SPECIFICATION forming part of Letters Patent No. 713,661, dated November 18, 1902.

Application filed April 2S, 1902. Serial No. 105,119. (No model T all wwm 15 72mg/ OOYLOQWZ.' light and seated only by gravity, and after 55 Be it known that I, FOSTER M. METCALF, a completion of the stroke the air'contained is citizen of the United States, residing at Batcompressed by the reverse action of the pistlecreek,in the county of Calhoun and State of ton until its tension exceeds the eiective 5 Michigan,have invented certain new and useforce of pressure and springs acting upon ful Improvements in Air-Compressor Valves, the upper surface of the delivery valves, 6o of which the following is a specification, refcausing the latter to rise and admit the comerence being had therein to the accompanying pressed air to the delivery-chamber. drawing. Any tendency of the delivery-valves to 1o This invention relates to that class of airpound or strike violently against their stopvalvcs which operate automatically by diflimits in lifting is resisted by the combined ference in air-pressure, and has for its object action of the seating-springsand added coma cushioned stop, acting against the lift, and pression of air contained within the cushionmeans for promptly effecting a closure of the chambers of the valves, both of which ele- 15 delivery ahead of the piston movement. As ments act also to seat the valves again quickly ordinarily constructed in compressors having as the piston pauses at the completion of the 7o valves of this class a much higher pressure stroke. must be attained in the air-cylinder than that In construction the cushion-caps C C' are contained within the delivery-chamber on to be made a nice sliding lit within the emzo account of the unbalanced area between the bracing-sleeves b b and provided with small upper and lower valve-surfaces before the inlet-holes hh at or near the top of sleevedelivery-valves can be unseated. As soon, hub when the valves are closed, the intehowever, as the valves actually lift the difrior chamber thus formed to be provided with ferential area disappears and the valves are a spring of suliicient tension to hold the valve z5 violently opened against the stop-limits with firmly to its seat and the top of cap against an emphatic action, which soon wears or the retaining-hood forming the delivery-cham- 8o breaks both stops and valves. ber of the compressor. I prefer to make top In the accompanying drawing,lhave shown of caps slightly convex, as shown, that conan air-cylinder and piston in partial section tact with hood shall be at or near the center 3o with the hood and valve-plate complete, elnline of valve-seat.

bracing a set of my improved air-valves. Having thus fully described and explained In the drawing, A represents the air-cylinthe advantages of my invention, whatI claim der; Y, end of yoke; Z, cylinder-head; Q, as new, and desire to secure by Letters Patair-piston; R, piston-rod; P, valve-plate; II, ent of the United States, is-

35 valve-chamber hood; I, suction-inlet; O, del. An air-compressor valve having an eX- livery-outlet; X X, ports. tended sleeve, a cushion-cap embraced With- 9o The valve details are designated p as folin the same, and in sliding engagement therelows: L L represent the suction or inletwith, an internal spring actingv to separate valves; U U, the delivery-valves; y y y y, the valve and cap, and the cap having radial` 4o the valve-seats; w w w, rho., the valveguide holes communicating with the interior therewings; Z) h, the Valve-sleeves; C C, the valve of, substantially as shown and described. cushion-caps; 7L h h h, admission-holes to 2. An air-compressor valve havingacylincushion-chambers between valves and caps, drical extension or sleeve, acushion-cap freely and S S valve-springs. fitted therein and 'forming therewith a cush- 45 The delivery-valves have each acup-shaped ion-chamber and having radial openings in cylindrical extenison or sleeve, within which its stem, and a spring located between the Ioo its the cup-shaped cap C, the space between valve and cap. forming a cushion-chamber, which is filled In testimony whereof I afx myl signature with air at delivery-pressure when the valels in presence of two witnesses. A

5o are seated by means of the radial holes z r h h in the Caps FOS FER M. METCALF.

The operation is as follows: Air is drawn Witnesses: into the cylinder by the piston through the RICHARD R. HICKS, inlet-valves, which are preferably made very ALBERT `C. PERKINS. 

